#include <53func.h>
int main(int argc, char *argv[])
{
    int shmid = shmget(0x1234,4096,IPC_CREAT|0600);
    ERROR_CHECK(shmid,-1,"shmget");
    char *p = (char *)shmat(shmid,NULL,0);

    sleep(30);
    printf("sleep over!\n");

    shmdt(p);
    return 0;
}

